About 400 angry workers have rallied outside Parliament House in Brisbane, calling on the Queensland Government to reconsider changes to WorkCover laws.

Members of the Queensland Nurses Union, Electrical Trades Union, United Voice, Australian Workers Union and the CFMEU attended the joint rally.

They chanted for Premier Campbell Newman to address the crowd.

Union members say the changes to workers compensation unfairly remove the rights of some injured workers to sue their employers.

They are worried it will impact vulnerable families and children of injured workers.

The Nurses Union also presented a petition to the Opposition Leader Annastacia Palaszczuk, calling on the Government to halt its plan to privatise health services.

Members of the Australian Nursing and Midwifery Federation, who have been attending a national conference nearby, marched through the CBD to join the rally.

'Ambulance chasers'

Parliament has been debating the proposed changes to WorkCover this afternoon.

Premier Campbell Newman says workers will still be eligible for other payouts.

"People have been encouraged by ambulance-chasing legal firms to sue their employers over small matters," he said.

The amendments are set to impact on the profit of legal firm Shine Lawyers.

The Australian Stock Exchange has been informed Shine Corporate Limited is likely to see net profit after tax reduce between $2 million to $2.5 million in 2015.

Shine managing director Simon Morrison says the company has adjusted to similar reforms in other states and is well placed to deal with the changes in Queensland by reducing its reliance on personal injury compensation.

Of the company's 40 offices, 27 are in Queensland.

But Rob Hodgson from the Australian Lawyers Alliance says his colleagues are more concerned about workers rights, and will campaign against the changes up until the next election.

"A lot of lawyers who are members of the LNP themselves are deeply concerned," he said.

Mr Hodgson says most claims are legitimate.

"Unworthy claims are weeded out early in the piece," he said.

Employers 'will save millions'

Business groups insist workers compensation changes are needed because some employees are taking advantage of the current system.

Nick Behrens from the Chamber of Commerce and Industry Queensland says the changes will cut premiums for employers, and workers will still be eligible for lump sum payments.

"What this bill does does not deny an employee the right to compensation," he said.

"At the moment, employees are trying their luck to see what sort of settlement they can receive from WorkCover and Queensland believes this is grossly unfair.

"It will save the Queensland business community $293 million."

The Queensland Trucking Association says some workers are shopping around to see how much they can "screw" out of the system.